Charleston climate

Charleston Weather in September

NOAA 1991-2020 normals for Cairo 3N, 19.9 km from Charleston

Average highs run from 86°F on September 1 to 77°F on September 30, and lows from 65°F to 54°F. Normal precipitation for the month is 3.51 in.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Charleston, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
82°F
Average low
60°F
Precipitation
3.51 in
Record high
102°FSep 1, 1953
Record low
34°FSep 23, 1989
Chance of a freeze
0%
Days of 90°F or more
3.9
Daylight
12 h 58 min to 11 h 50 min
Cloud cover
46%
Humidity
66%
Dew point
58°F
Wind
7.2 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Sep 186°F65°F102°F 195348°F 19670%
Sep 286°F64°F100°F 201150°F 19650%
Sep 386°F64°F101°F 195448°F 19520%
Sep 485°F64°F101°F 201146°F 19520%
Sep 585°F63°F102°F 195444°F 19880%
Sep 685°F63°F101°F 195444°F 19880%
Sep 785°F63°F99°F 196048°F 19560%
Sep 884°F62°F97°F 196045°F 19560%
Sep 984°F62°F99°F 198045°F 19560%
Sep 1084°F62°F101°F 198046°F 19760%
Sep 1183°F61°F99°F 195347°F 19690%
Sep 1283°F61°F96°F 201347°F 19550%
Sep 1383°F61°F97°F 198045°F 19550%
Sep 1482°F60°F99°F 198041°F 19640%
Sep 1582°F60°F99°F 202545°F 19610%
Sep 1682°F60°F98°F 202644°F 19610%
Sep 1781°F59°F99°F 202644°F 19660%
Sep 1881°F59°F99°F 202644°F 19730%
Sep 1981°F58°F98°F 195440°F 19910%
Sep 2080°F58°F96°F 195541°F 19730%
Sep 2180°F58°F98°F 201841°F 19620%
Sep 2280°F57°F98°F 201040°F 19950%
Sep 2379°F57°F96°F 201034°F 19890%
Sep 2479°F57°F95°F 201039°F 19950%
Sep 2579°F56°F93°F 199838°F 19650%
Sep 2678°F56°F92°F 199839°F 19910%
Sep 2778°F55°F94°F 199837°F 19910%
Sep 2878°F55°F95°F 195335°F 19670%
Sep 2977°F54°F98°F 195336°F 19670%
Sep 3077°F54°F95°F 199840°F 19630%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Charleston, in percent, and of at least 0.1 inch of snowfall.00.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:28 AM, sunset 7:26 PM
September 30
sunrise 6:52 AM, sunset 6:42 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00093809 (Cairo 3N), public domain. Records: NOAA GHCN-Daily, station USC00237772, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.